to see if they jnow each other
If you watch two dogs greet each other, you will often see them smelling each others' genitals and anuses. These are the areas of highest scent on dogs, and scent tells a dog everything that it needs to know about another animal.
you separate them to you think they are ready to be with each ohter again
They can be nice to each other when they are brought up together. Some types of cats and dogs are more accepting of other animals, but then some just are uncomfortable with it.
They lick each other. === ===
Dogs great each other by sniffing each other. Your dog is just saying "hey, pleased to meet you, what's your name?". Female dogs will also do this as a flirting behavior especially if they are in season.
it is good and bad smelling other people to each cause by stomachache
They bark at other dogs to communicate with them they are talking to each other
Usually, yes. Many dogs and cats are able to live with each other without any tussle.
yes cause my dogs did
This is something that comes by instinct to dogs. They are trying to dominate each other and no, that's not bad. They are not hurting each other they are just play - fighting. My 2 dogs do this all the time.
they take care of each other like wolf packs take care of each other
You would have 10 puppies plus the two original dogs so 12 dogs all together.